| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 16°F | 35°F | 25°F | 2.3" |
| February | 16°F | 37°F | 26°F | 2.6" |
| March | 25°F | 47°F | 35°F | 2.9" |
| April | 36°F | 62°F | 49°F | 3.1" |
| May | 47°F | 73°F | 60°F | 3.8" |
| June | 57°F | 81°F | 68°F | 5.2" |
| July | 62°F | 85°F | 73°F | 5.4" |
| August | 59°F | 83°F | 71°F | 4.4" |
| September | 53°F | 77°F | 64°F | 3.8" |
| October | 42°F | 64°F | 52°F | 4.9" |
| November | 31°F | 52°F | 41°F | 2.6" |
| December | 22°F | 40°F | 31°F | 3.7" |
| Index | Delanson | New York | National |
| Air quality index | 37 | 43 | 42 |
| Pollution index | 1,263,530 | 6,179,275 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 322 |
| Days with moderate air quality | 43 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.001% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Amsterdam, NY | 17,823 | 37 | 26.0% |
| Tribes Hill, NY | 869 | 37 | 26.0% |
| Duane Lake, NY | 216 | 37 | 26.0% |
| Rotterdam, NY | 21,939 | 37 | 26.0% |
| Central Bridge, NY | 519 | 37 | 26.0% |
| Delanson, NY | 350 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Traskwood, AR | 350 | 38 | 24.0% |
| Bode, IA | 350 | 15 | 70.0% |
| Kilbourne, IL | 350 | 40 | 20.0% |
| Steward, IL | 350 | 42 | 16.0% |
| Bremen, KY | 350 | 43 | 14.0% |
| Delanson, NY | 350 | 37 | 26.0% |
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